.main-content {
  padding: 40px 15%;
}
.main-content .title {
  position: relative;
  height: auto;
  padding: 20px;
}
.title .text {
  position: absolute;
  left: calc(50% - 60px);
  top: 0;
  z-index: 20;
  width: 120px;
  text-align: center;
  background-color: #fff;
  color: rgb(51,51,51);
}
.main .text .cn {
  font-size: 18px;
}
.main .text .en {
  font-size: 14px;
}
.line {
  position: absolute;
  left: 0px;
  top: calc(50% - 1px);
  z-index: 10;
  width: 100%;
  height: 2px;
  background-color: rgb(51,51,51);
}
.content {
  position: relative;
  height: auto;
  padding: 20px 0 50px 0;
  color: rgb(51,51,51);
}
/* 图片排版 */
.content .img-group{
  display: flex;
  justify-content: space-around;
  overflow: hidden;
}
.img-group img {
  width:100%;
}
.content .img-group .left {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
}
.img-group .left-top {
  display: flex;
  justify-content: space-around;
}
.img-group .right img {
  padding:5px;
}
.img-group .left-top img {
  padding:0;
  width: 50%;
  padding: 5px;
}
.left-bottom img {
  padding: 5px;
}
.main-content.join {
  background: linear-gradient(rgba(0, 0, 0, .6), rgba(0, 0, 0, .6)),url('../img/3039.png') no-repeat center;
  background-size: cover;
}
/* “加入我们”板块 */
.join .content {
  position: relative;
  margin: 10px calc(50% - 325px);
  padding: 40px;
  width: 650px;
  border: 1px #fff solid;
  text-align: center;
  background-color: rgba(0, 0, 0, .3);
  color: #fff;
}
.join p {
  padding: 10px;
  font-size: 36px;
}
.join .btn {
  margin: 20px 0 20px calc(50% - 100px);
  padding: 15px 20px;
  width: 200px;
  font-size: 14px;
  background-color: rgb(255, 255, 255, .3);
  transition: background-color 0.25s;
}
.join .btn:hover {
  cursor: pointer;
  background-color: rgb(255, 255, 255, .5);
}
.content.case {
  display: flex;
  justify-content: space-around;
  color: rgb(106,106,106);
}
.content.case .up, .content.case .down{
  width: 20%;
}
.content.case > div > img {
  width: 100%;
}
.content.case .type {
  height: 100px;
  padding: 30px;
  font-size: 12px;
}
.type p {
  text-align: center;
}
.type img {
  width: 10px;
  margin-left: calc(50% - 5px);
}
/* “签约流程”板块 */
.main-content.sign {
  background-color: rgb(240,240,240);
}
.main-content.sign .text {
  background-color: rgb(240,240,240);
}
.sign p {
  text-align: center;
  font-size: 12px;
}
.step, .about > div {
  display: flex;
  justify-content: center;
  padding: 20px;
}
.step > div, .step > img {
  margin: 10px;
  padding:10px;
}
.step > div {
  width: 200px;
  text-align: center;
  font-size: 13px;
  background-color: rgb(51, 51, 51);
  color: #fff;
}
.step > img {
  width: 80px;
  height: 100%;
}
/* “关于我们”板块 */
.about img {
  width: 50%;
}
.about-content {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 50%;
  padding: 0 20px;
}
.about-content .intro {
  text-align: center;
  line-height: 28px;
}
.about h2 {
  padding: 10px 0;
}
.about p {
  font-size: 14px;
}
.about > p {
  text-align: center;
}
.grey-line {
  display: flex;
  justify-content: right;
  background-color: rgb(245, 245, 245);
}
.grey-line.top {
  width: 100%;
  height: 3px;
}
.grey-line.bottom {
  width: 100%;
}
.grey-line .btn {
  width: 120px;
  padding: 10px 20px;
  text-align: center;
  color: #fff;
  background-color: rgb(51, 51, 51);
  transition: background-color 0.25s;
}
.grey-line .btn:hover {
  cursor: pointer;
  background-color: rgb(78, 78, 78);
}
.back-top {
  position: fixed;
  right:50px;
  bottom: 50px;
  width:50px;
  height: 50px;
  border: 1px rgb(124, 124, 124) solid;
  border-radius: 25px;
  cursor: pointer;
  line-height: 50px;
  text-align: center;
  background-color: #fff;
  opacity: 0;
  transition: opacity 0.25s;
}